Zig

Open an SSH Tunnel

Demonstrates Socket.SshOpenTunnel, which connects to an SSH server and initializes an SSH tunneling session, then authenticates it.

Background. An SSH tunnel lets a socket reach a destination host through an SSH server using port forwarding. The sequence is: open the tunnel, authenticate, then open forwarded channels to destinations.

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Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const socket = try chilkat.Socket.init();
    defer socket.deinit();

    // Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
    // not required.
    socket.sshOpenTunnel("ssh.example.com", 22) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    // After the tunnel is open, authenticate before opening forwarded channels.
    // The SSH password should come from a secure source rather than being hard-coded.
    const ssh_password = "mySshPassword";
    socket.sshAuthenticatePw("sshUser", ssh_password) catch {
        std.debug.print("{s}\n", .{try socket.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("SSH tunnel established and authenticated.\n", .{});
}